#include<iostream>
#include<algorithm>
using namespace std;
int main(void)
{
	int n, i, ans;
	long long int pa[100005] = {0};

	cin >> n;
	ans = n;
	for (i = 0; i < n; i++) {
		cin >> pa[i];
	}
	sort(pa, pa + n);
	for (i = 0; i < n - 1; i++) {
		if (pa[i] == pa[i + 1])
			ans -= 2;
		if (pa[i] == pa[i + 1] && pa[i + 1] == pa[i + 2])
			ans += 1;
	}
	if (pa[0] == pa[n - 1])
		ans = 0;
	cout << ans << endl;


	return 0;
}